Ordered list in the form (

*x*_{1}*, x*_{2}*, …, x*_{n}) where*x*_{i}represent elements of a perfectly defined set.### Examples

- The coordinate pair (2, 5) is an
*n*-tuple of order 2. - An
*n*-tuple of order 3, such as (2, 5, 7) is called a*triplet*. - The next orders are called:
*quadruplet*,*quintuplet*,*sextuplet*, etc.

### Etymological Note

- The suffix
*tuple*is an extension of the multiplicative suffix*–uple*or*–iple*that we find in words like*triple*,*quadruple*,*quintuple*, etc. and in the word*d*. The Indo-European origin of this suffix means “folded” or “doubled”. Therefore, to quadruple something, we must multiply it by 4.**upli**cate - The suffix
*tuple*is used for some substantives (nouns) where there is the idea of duplicating or reproducing something. So, an*n-tuple*of elements is an assembly of*n*elements in which we can easily distinguish the first, second, … the*n*-th.